D491 Introduction to Analytics - Set 1 - Part 3

Correct Answer: It reduces variance in model evaluation

K-fold cross-validation reduces variance by averaging the results from multiple train-test splits, providing a more reliable estimate of model performance.

Correct Answer: Normalization

Normalization scales the range of numerical features to a consistent range, typically between 0 and 1, ensuring that all features contribute equally to the model.

Correct Answer: SAS/ACCESS

SAS/ACCESS allows users to connect to relational databases and data warehouses to retrieve and manipulate data during the model planning phase.

Correct Answer: Mean squared error (MSE)

Mean squared error measures the average squared difference between actual and predicted values, making it a standard metric for regression models.

Correct Answer: Pie chart

Pie charts are commonly used to show the proportion of different categories within a dataset.

Correct Answer: To classify data into distinct categories

Decision trees are used for classification tasks, where data is divided into distinct categories based on decision rules.

Correct Answer: Box plot

A box plot can compare the distribution of multiple variables simultaneously by displaying their spread, quartiles, and outliers.

Correct Answer: Classifying binary outcomes

Logistic regression is used to predict the probability of binary outcomes (e.g., true/false, yes/no).

Correct Answer: To remove noise from data

Smoothing techniques are used in time series analysis to remove random noise and reveal underlying trends.

Correct Answer: D3.js

D3.js is a JavaScript library used to create interactive, web-based visualizations for large datasets.